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1 Application Defense Tactics & Strategies - WAF at the Gateway Shreeraj Shah Blueinfy Solutions Pvt. Ltd. Dubai HackInTheBox 2009 Who Am I? shreeraj@blueinfy.com shreeraj@blueinfy.com Founder & Director Blueinfy Solutions Pvt. Ltd. (Brief) SecurityExposure.com Past experience Net Square, Chase, IBM & Foundstone Interest security research Published research Articles / Papers Securityfocus, O erilly, DevX, InformIT etc. Tools wsscanner, scanweb2.0, AppMap, AppCodeScan, AppPrint etc. Advisories -.Net, Java servers etc. Books (Author) 2.0 Security Defending Ajax, RIA and SOA Hacking Services Hacking Agenda Application Security Landscape Application Security Approaches Application Vulnerabilities - Demo WAF A Quick Look.NET and HTTP processing Introducing IHTTPModule Security Framework through set of Modules Conclusion Application Security Landscape Methods Concepts, Code Walk and Demos MIS Training Institute Page 1
2 Case of Portal Case of Banking 2.0 Portal Buy / Sell Technologies & Components Dojo, Ajax, XML Services, Blog, Widgets Scan with tools/products failed Security issues and hacks SQL injection over XML Ajax driven XSS Several XSS with Blog component Several information leaks through JSON fuzzing CSRF on both XML and JS-Array» HACKED» DEFENSE Scanning application for vulnerabilities Typical banking running with middleware Vulnerabilities Profile manipulation (Logical and Hidden values) XSS Strong session management but URL rewriting SQL is impossible in this case Application Security State 95% companies hacked from web ports [FBI/CSI] 3 out of 4 web sites are vulnerable to attack (Gartner) Every 1500 lines of code has one security vulnerability (IBM Labs) 2000 attacks / week for unprotected web site Real life hacks & trends MIS Training Institute Page 2
3 Next Generation Applications % of companies are investing in Services as part of their 2.0 initiative (McKinsey 2007 Global Survey) By the end of 2007, 30 percent of large companies have some kind of 2.0-based business initiative up and running. (Gartner) Services or Service- Oriented Architecture (SOA) would surge ahead. (Gartner) Real life Cases 2.0 Adding filter through CSRF Attacking blogs and boards Flash components Loading js file through flash from scrapbook XSS through RSS feed HTTP Response Splitting Source: The Hacking Incidents Database [ Generic vectors 1.0/2.0 Most common vulnerabilities Recent Generic threats 1.0/2.0 Threat types Recent Last Year Last Year Source Application Security Consortium Source Application Security Consortium MIS Training Institute Page 3
4 Root cause of Vulnerabilities OWASP Top 10 CSI Security Survey : Vulnerability Distribution misconfiguration, other problems 36% programming errors 64% misconfiguration, other problems programming errors Source OWASP CVE/CWE - Errors CVE/CWE - Errors Insecure Interaction Between Components These weaknesses are related to insecure ways in which data is sent and received between separate components, modules, programs, processes, threads, or systems. CWE-20: Improper Input Validation CWE-116: Improper Encoding or Escaping of Output CWE-89: Failure to Preserve SQL Query Structure (aka 'SQL Injection') CWE-79: Failure to Preserve Page Structure (aka 'Cross-site Scripting') CWE-78: Failure to Preserve OS Command Structure (aka 'OS Command Injection') CWE-319: Cleartext Transmission of Sensitive Information CWE-352: Cross-Site Request Forgery (CSRF) CWE-362: Race Condition CWE-209: Error Message Information Leak Risky Resource Management The weaknesses in this category are related to ways in which software does not properly manage the creation, usage, transfer, or destruction of important system resources. CWE-119: Failure to Constrain Operations within the Bounds of a Memory Buffer CWE-642: External Control of Critical State Data CWE-73: External Control of File Name or Path CWE-426: Untrusted Search Path CWE-94: Failure to Control Generation of Code (aka 'Code Injection') CWE-494: Download of Code Without Integrity Check CWE-404: Improper Resource Shutdown or Release CWE-665: Improper Initialization CWE-682: Incorrect Calculation Source CWE/CVE - Source CWE/CVE - MIS Training Institute Page 4
5 CVE/CWE - Errors PCI-DSS requirements Porous Defenses The weaknesses in this category are related to defensive techniques that are often misused, abused, or just plain ignored. CWE-285: Improper Access Control (Authorization) CWE-327: Use of a Broken or Risky Cryptographic Algorithm CWE-259: Hard-Coded Password CWE-732: Insecure Permission Assignment for Critical Resource CWE-330: Use of Insufficiently Random Values CWE-250: Execution with Unnecessary Privileges CWE-602: Client-Side Enforcement of Server-Side Security To secure application Put WAF at the gateway Get your source code audited Source CWE/CVE - New Attack Vectors Application Layout Internet DMZ Trusted XML manipulation SOAP and XML-RPC attacks and tempering CSRF with Ajax and Flash XSS with JSON streams Mashup and RSS attacks Client Scripted Server Engine Static pages Dynamic pages HTML,HTM etc.. ASP DHTML, PHP,CGI Etc.. X DB Application Servers And Integrated Framework ASP.NET with.net J2EE App Server Services Etc.. Internal/Corporate MIS Training Institute Page 5
6 Attack Surface and Controls 2.0 Architecture Application Controls Documents Services Attacks Attacks SQL injection Parameter tempering Etc.. Brute force RPC buffer overflow Null session Etc.. X X X Services Business Application Level Application Level /customized etc.. Services Level IIS web/smtp/pop etc.. Operating System Level ipc$/wu-ftpd/sunrpc etc.. Browser Ajax RIA (Flash) HTML / JS / DOM Internet Blog Mails News Internet 2.0 Start Database Weather Authentication Bank/Trade RSS feeds Firewall Added Defense Accounts/Shares/Patches/updates/Logging/Auditing/ Ports/Registries etc Application Infrastructure Services End point How to defend? Application Security Approaches Two approaches Secure Coding and having proper validations at all levels to guard application layer. (Strategic) Application layer traffic filtering to detect and block malicious requests/responses. (Tactical) MIS Training Institute Page 6
7 Secure Coding Application Firewall (WAF) It is perfect and ideal approach. But Needs recoding Takes longer time in fixing Quick fix is required many times QA process after changes High cost Any work around? HTTP request and response filtering like traditional firewall. But it is specific to Application layer and rules should be well crafted. It is catching up and successful in detecting and blocking unintended traffic. It can block SQL injection, XSS, CSRF and many other attack vectors. Application Vulnerabilities Let s look at some vulnerabilities SQL (JSON and Traditional) XSS XPATH Detecting it. Scanning Code Analysis WAF A Quick Look MIS Training Institute Page 7
8 Application Firewall (WAF) Application Infrastructure Internet DMZ Trusted Advantages Quick to add rules Can act as first line of defense No recoding is required Easy to implement and manage Disadvantage Performance a major hit Rule based and bypass is possible Client Corporate Firewall Server Application Resource.. DB Internal/Corporate WAF in Action Internet DMZ Trusted Corporate Firewall Application Firewall 1 SQL injection attack SQL injection = 1&product = 7 Client IIS Server 2 Application Resource.. Server app app app app DB DB Application IDS DB Internal/Corporate MIS Training Institute Page 8
9 SQL injection attack SQL injection WAF filtering Server app app app app Payloads,, OR, SELECT = 1&product = 7 DB DB WAF models Following models are possible Network traffic level filtering [SSL is an issue] Host level at Server Host level + Reverse Proxy IIS architecture.net and HTTP processing It is important to understand how IIS works?.net gets integrated into IIS and applications can leverage the events IIS7.0 is coming up with a change that can help in building WAF MIS Training Institute Page 9
10 IIS higher level view IIS ASP.NET IIS Limitation ASP.NET is not having direct access to the HTTP pipe Can access ASP.NET requests only Framework is part of ISAPI and hooked to IIS Needs C++ based hooks to access generic pipe Solved! IIS 7.0 Change in Architecture Integrated mode.net assemblies can be hooked directly to the pipe Full access to HTTP requests Can handle both.net based as well as generic requests Access to all incoming requests MIS Training Institute Page 10
11 IIS 7.0 Integrated Mode Introducing IHTTPModule How to hook? HTTP pipe for.net application has separate scope and HTTP pipeline can be accessed. HTTP request can be accessed before it hits application resources. HTTPModule and HTTPHandler are defense at your gates. Application Client Request Response IIS aspnet_isapi.dll HttpApplication HttpHandler HttpModule HttpModule HttpModule Application Resource MIS Training Institute Page 11
12 Interfaces and Hooks Leveraging Interfaces HttpRuntime HttpApplicationFactory HttpApplication HttpHandlerFactory Handler Application Firewall & IDS IHttpModule HTTPModule and HTTPHandler - can be leveraged. Application layer firewall can be cooked up for your application. Similarly IDS for web application can be developed. It sits in HTTP pipe and defend web applications. For IIS 7.0 Integrated mode with full access Possible to cook up reverse proxy as well Traffic can be controlled at the gates Sound defense can be created with minimal coding Your module can be on top of the pipe Can access HttpResponse.Headers HttpRequest.Headers HttpRequest.ServerVariables Implementing IHTTPModule MIS Training Institute Page 12
13 IHTTPModule IHTTPModule Managed code in C# can be hooked into HTTP pipe. Module can help in filtering HTTP requests. Let s see its implementation. public class iappfilter : IHttpModule { } Access to HttpApplication HttpApplication Event Mapping MIS Training Institute Page 13
14 Event Trapping and Firewall Accessing HTTP request Access with BeginRequest Access to Http Context Access to headers All server variable Complete access for filtering Hooking to HTTP pipe Processing POST public void Init(HttpApplication application) { application.beginrequest += (new EventHandler(this.Application_BeginRequest)); if (app.request.servervariables["request_method"] == "POST") { long streamlength = app.request.inputstream.length; byte[] contentbytes = new byte[streamlength]; app.request.inputstream.read(contentbytes, 0, (int)streamlength); postreq = System.Text.Encoding.UTF8.GetString(contentBytes); private void Application_BeginRequest(Object source, EventArgs e) { HttpApplication application = (HttpApplication)source; HttpContext context = application.context; MIS Training Institute Page 14
15 Request / Response Putting it in action DLL get created after compilation Module in Bin folder Adding to config file It is different with IIS 7.0 for integrated mode Directives are different Let s see in detail Accessing all requests Security Framework through set of Modules It is important to access all incoming HTTP requsts IIS 6.0 limitation can be overcome by using wildcard mapping [Some what] IIS 7.0 Leveraging integrated mode MIS Training Institute Page 15
16 IIS 6.0 Wildcard mapping IIS 7.0 Integrated mode <modules> <add name="iappwall" type="iappwall"/> </modules> Security Modules Authorization Module Various module can be cooked up. Authorization, Authentication, Filtering, XML processing, IDS etc. All of them can be part of one DLL or multiple. Limited access to IP addresses Blocking sensitive directories Session based access to various area of application MIS Training Institute Page 16
17 Validation Module 2.0 Security Module Detecting attack vectors like XSS or SQL injection Blocking those requests at the module level Total security to all incoming parameters both over GET and POST 2.0 runs on XML, JSON, JS- Array etc.. Intelligent module to detect these sort of traffic and block malicious requests Protecting Services running over SOAP, XML/JSON-RPC, REST etc. CSRF Defense Module Response Filtering Module Cross Site Request Forgery is a big concern for sensitive forms Protection by referrer tag or token by HTTP module Securing application against CSRF attack vectors Limited response filtering for critical resources Monitoring outgoing requests Capturing suspicious traffic and blocking them 2.0 framework defense RSS or proxy based responses MIS Training Institute Page 17
18 IDS Module Logging all suspicious requests for forensic use Logging and monitoring can be improved Logging to central database, file or OS events. Reverse Proxy Module Defending non IIS applications with reverse tunneling. IIS 7.0 as front end server and securing internal servers Complete control over full traffic going in/out Conclusion Next generation.net application can be defended by IHTTPModules IIS 7.0 Integrated mode is going to play a big role 2.0 application needs better filtering capabilities and IHTTPModule can deliver it Questions shreeraj@blueinfy.com shreeraj@blueinfy.com MIS Training Institute Page 18
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